/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute.preverification;

import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.attribute.preverification.visitor.VerificationTypeVisitor;

/**
 * This VerificationType represents a Uninitialized type.
 *
 * @author Eric Lafortune
 */
public class UninitializedType extends VerificationType {
    public int u2newInstructionOffset;

    /**
     * Creates an uninitialized UninitializedType.
     */
    public UninitializedType() {}

    /**
     * Creates an UninitializedType pointing to the given 'new' instruction.
     */
    public UninitializedType(int u2newInstructionOffset) {
        this.u2newInstructionOffset = u2newInstructionOffset;
    }

    // Implementations for VerificationType.

    public int getTag() {
        return UNINITIALIZED_TYPE;
    }

    public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int instructionOffset,
        VerificationTypeVisitor verificationTypeVisitor) {
        verificationTypeVisitor.visitUninitializedType(clazz, method, codeAttribute, instructionOffset, this);
    }

    public void stackAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int instructionOffset,
        int stackIndex, VerificationTypeVisitor verificationTypeVisitor) {
        verificationTypeVisitor.visitStackUninitializedType(clazz, method, codeAttribute, instructionOffset, stackIndex,
            this);
    }

    public void variablesAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, int instructionOffset,
        int variableIndex, VerificationTypeVisitor verificationTypeVisitor) {
        verificationTypeVisitor.visitVariablesUninitializedType(clazz, method, codeAttribute, instructionOffset,
            variableIndex, this);
    }

    // Implementations for Object.

    public boolean equals(Object object) {
        if (!super.equals(object)) {
            return false;
        }

        UninitializedType other = (UninitializedType)object;

        return this.u2newInstructionOffset == other.u2newInstructionOffset;
    }

    public int hashCode() {
        return super.hashCode() ^ u2newInstructionOffset;
    }

    public String toString() {
        return "u:" + u2newInstructionOffset;
    }
}
